Use Clone Troopers as the bulk of an attack squad. When multiplied by four or five units their rapid rate of fire is enough to put anything away. When encountering Droidekas seek cover and blast from distances.

5 shots per clip and a slow rate of fire
Poor close up with the Sniper Rifle
Ineffective on maps with nowhere good to snipe

Strategy/ Tips

The Sharpshooter should hold back at long distances preferably near ammo droids as they are constantly re-supplied with sniper rounds. Pick off Droideka's, their personal shield makes them easy to spot. Wait
for it to drop before firing a couple of rounds to eliminate these droids.